Values of free molecular diffusion coefficients in water needed. Necessary for the calculation of the retardation factor Rf of the arsenic anions in the soil.
Hi!
If you don´t get a directly measured diffusion coefficient in water:
You can try the Wilke-Chang - Correlation (theoretical diffusion-coefficients in water).
Details can be found in Reid et al. (1988):The properties of gases and liquids. McGraw-Hill, New York
Hope this helps
Stefan
You might wish to consult the paper:
The difference of diffusion coefficients in water for arsenic compounds at various pH and its dominant factors implied by molecular simulations.
Masato Tanakaa, Yoshio Takahashia, Noriko Yamaguchic, Kyoung-Woong Kimd, Guodong Zhengb, Mika Sakamitsua.
Geochimica et Cosmochimica Acta, Volume 105, 15 March 2013, Pages 360–371
And the references therein.
The following article describes the dependence of the diffusion coefficient of arsenite and arsenate on the pH of the water. Might be of interest of you.
Masato Tanaka, Yoshio Takahashi, Noriko Yamaguchi, Kyoung-Woong Kim, Guodong Zheng, Mika Sakamitsu: "The difference of diffusion coefficients in water
for arsenic compounds at various pH and its dominant
factors implied by molecular simulations".
Geochimica et Cosmochimica Acta 105 (2013) 360–371.
O, I just saw that Bernhard Boudreau already gave you this tip.
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